How is Harriet's understanding of using the apparatus described?

The answer suggests that Harriet does not grasp the challenges associated with using the apparatus. This interpretation indicates a lack of understanding or awareness of the complexities involved in its operation. If Harriet truly had insight into the difficulties, it would reflect a more nuanced understanding rather than a complete ignorance.

The context of the other choices indicates various levels of understanding or skill. If she found it easy to handle, that would imply she has some level of proficiency and familiarity, which contradicts the notion that she has no clue. The third option suggests she shows great proficiency, indicating an advanced ability that again contrasts with a lack of understanding. Lastly, being fully aware of how to operate the apparatus implies knowledge and competence, which does not align with the idea of not having a clue. Thus, the chosen answer effectively captures Harriet's lack of understanding regarding the operational difficulties.